OBS Studio - Free and open source software for video recording and live streaming for Mac, Windows and Linux.
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
XSplit - Live stream and record your content with ease & share it to streaming services like Twitch, YouTube, Facebook, Mixer, etc. Start your broadcast today.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Screencast-O-Matic - Free version Records up to 15 minutes, premium is $15/year.
LightShot - The fastest way to take a customizable screenshot.